Nightmare is a recurring boss character in the Devil May Cry video game series, known for its monstrous, amorphous form and formidable strength. Often encountered as an obstacle, Nightmare serves as a significant adversary to the protagonist, Dante. Created by demonic forces, it tests the player's skills with unpredictable attacks and the ability to absorb energy from its surroundings. Its presence in the series adds a layer of challenge, mystery, and horror to the game's atmosphere.